<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
</body>
</html>
<script type="text/javascript">
var wheel = function(event) {
var delta = 0;
if (!event) /* For IE. */
event = window.event;
if (event.wheelDelta) { /* IE/Opera. */
delta = event.wheelDelta / 120;
} else if (event.detail) {
delta = -event.detail / 3;
}
if (delta)
handle(delta);
if (event.preventDefault)
event.preventDefault();
event.returnValue = false;
}
if (window.addEventListener) {
/** DOMMouseScroll is for mozilla. */
window.addEventListener('DOMMouseScroll', wheel, false);
}
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;
var handle = function(delta) {
var random_num = Math.floor((Math.random() * 100) + 50);
if (delta < 0) {
alert("鼠标滑轮向下滚动：" + delta + "次！"); // 1
// $("btn_next_pic").onclick(random_num);
return;
} else {
alert("鼠标滑轮向上滚动：" + delta + "次！"); // -1
// $("btn_last_pic").onclick(random_num);
return;
}
}
</script>